Question about Magellan RoadMate 700 GPS Receiver

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Weak reception, broken surface mount component

My Magellan Roadmate 700 recently started having problems acquiring and holding the satellite signal. I opened the unit to check for problems around the antenna and discovered that a surface mount capacitor or resistor had been broken off the circuit board. The pads are for a 1206 device, but there is no reference designator silk screened on the board. Consequently I don?t know if it was a capacitor or resistor. The area is next to the gold antenna connector in an area that is covered by a translucent tape. Does anyone know of a place where I can find a schematic? Thanks, Papawayne

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Hi DanEz007

Thanks for the reply.  The broken part is a surface mount capacitor in the antenna circuit.  I will describe the circuit as best I can.  The signal from the antenna goes through a series circuit made up of a 470-Ohm resistor, 33K resistor and an inductor.  Connecting at the junction of the 470 and 33K resistors are 2 capacitors in parallel; their other end connects to ground.  Also in parallel to the series network is a capacitor.  The cap connection is from the antenna to the output of the inductor.  Now for the missing part; a capacitor connected between the junction of the 33K and the inductor and ground. 

 

This series-parallel circuit connects to a 4-pin device. The only number on the device is "T79". 

 

I know a verbal schematic is awkward, so if you would consider emailing me at waynenjoni@gmail.com I could send you a sketch of the circuit.  I assume that the missing cap was probably a small picofard cap used to tune the input.  Sure hope you can help.

 

Thanks,

 

Papawayne1

Posted on Oct 18, 2007

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You can not find any schematics for the Magellans.  The schematics are classified.  Even when repairing GPS's for Magellan we didn't receive full schematics.  If your talking about the RF cable connector on the I/O Board (the board attached to the rear housing), then it's an easy solder fix.  For the capacitor/resistor:  I'm not sure where you found the capacitor origin, but if it's black with four legs coming off and parallel with the IC then tell me and I'll msg you back the rest. 

Posted on Oct 15, 2007

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